Synthesis of microwave and acoustic wave resonator filters for wireless communication systems
Abstract
Future wireless communication systems require more highly demanding specifications and optimally using the electromagnetic spectrum. These systems are highly frequency-agile and operate in environments with high levels of interference. The future RF frond ends require adaptively responding to such systems and are in need of nimble components, such as high gain tunable antennas, high selectivity and isolation and low loss tunable filters, large signal-to-noise ratio tunable low noise amplifiers, and high efficiency tunable power amplifiers. Filters to define communication channels in such tunable systems are critical and typically the bottleneck in achieving these performance goals. This dissertation focuses on tunable and reconfigurable filter synthesis that have the potential to alleviate the bottleneck currently experienced by agile communication systems. The presented filter synthesis method and techniques promise the capability to dynamically adapt the center frequency, order, response shape, bandwidth, quality factor-attenuation level tradeoff, arbitrary transmission zero spectral location, and hybrid electromagnetic and surface acoustic resonators design. These synthesis method and techniques include novel absorptive bandstop filter designs, non-traditional coupling matrix for complex impedance filters, arbitrary phase bandstop filter, resonator-coupled structure that enables dynamic reconfiguration between electric, magnetic, and close-to-zero coupling values, and filters of non-traditional frequency responses with hybrid microwave and acoustic resonators.
Degree
Ph.D.
Advisors
Chappell, Purdue University.
Subject Area
Electrical engineering
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